Mass-independent isotope effects in Archean (2.5 to 3.8 Ga) sedimentary sulfides determined by ion microprobe analysis

Mass-independent isotope effects in Archean (2.5 to 3.8 Ga) sedimentary sulfides determined by ion microprobe analysis

We report sulfur isotope anomalies with Delta-S-33, the deviation from a mass-dependent fractionation line for the three-isotope system (S-34/S-32 vs S-33/S-32), ranging up to +/-2 permil within individual Archean sedimentary sulfides from a variety of localities. Our measurements, which are made in...

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Veröffentlicht in:Geochimica et cosmochimica acta 2003-05, Vol.67 (9), p.1635-1658
Hauptverfasser: Moizsis, S J, Coath, C D, Greenwood, J P, McKeegan, K D, Harrison, T M
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container_issue 9
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container_title Geochimica et cosmochimica acta
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creator Moizsis, S J
Coath, C D
Greenwood, J P
McKeegan, K D
Harrison, T M
description We report sulfur isotope anomalies with Delta-S-33, the deviation from a mass-dependent fractionation line for the three-isotope system (S-34/S-32 vs S-33/S-32), ranging up to +/-2 permil within individual Archean sedimentary sulfides from a variety of localities. Our measurements, which are made in situ by multicollector secondary ion mass spectrometry, unequivocally corroborate prior bulk measurements of mass-independent fractionations (MIFs) in sulfur and provide additional evidence for an anoxic atmosphere on the Earth before about 2 Ga. This technique also offers new opportunities for exploring ancient sulfur metabolisms preserved in the rock record. The presence of MIF sulfur in sulfides from a > 3.8-Ga Fe-rich quartzite from Akilia (island), West Greenland, is consistent with a marine sedimentary origin for this rock.
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title Mass-independent isotope effects in Archean (2.5 to 3.8 Ga) sedimentary sulfides determined by ion microprobe analysis
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